Overview

The Bay Area Water Supply and Conservation Agency (BAWSCA) typically conducts an annual survey of its members in order to update key agency-wide information and assist in projecting wholesale customer water demands and population. Summarized below and included in the following pages in written, tabular, and/or graphic form are the most pertinent and interesting highlights of the FY 2011-12 survey.

Past, Current and Projected SFPUC Purchases

Current Water Purchases from SFPUC

Wholesale customers reported SFPUC purchases of 145.4 mgd in FY 2011-12, up slightly from the total 144.9 mgd purchased in FY 2010-11. Compared with the prior 10 year average, purchase levels in FY 2011-12 were below average by 21.1 mgd. Compared to FY 2001-02, FY 2011-12 purchases are lower by 25.2 mgd, a difference of about 15%. The highest single year occurred in FY 1986-87 when the wholesale customers purchased 184.8 mgd from the SFPUC.

Projected Water Purchases from SFPUC

 As part of its action on the Program Environmental Impact Report (PEIR) for its Water System Improvement Program (WSIP), the SFPUC made the decision to limit wholesale customer purchases from the San Francisco Regional Water System to 184 mgd and retail customer purchases from the Regional Water System to 81 mgd through 2018. In June 2012, BAWSCA notified the SFPUC that the projected BAWSCA purchases in 2018 are expected to be 171.8. 

 

Total Water Suppy and Demand

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Current BAWSCA-Wide Total Water Demand Compared to Pre-Drought Conditions

For FY 2011-12, total demand of the BAWSCA service area was 223 mgd. In comparison, in FY 1996-97, BAWSCA-wide demand, including demand for sources in addition to the regional water system, equaled the pre-drought demand of FY 1986-87 at 260 mgd.

 Meeting Projected BAWSCA-Wide Total Water Demand

In FY 2008-09, BAWSCA and its member agencies initiated the development of a Long term Reliable Water Supply Strategy (Strategy) to meet the projected water needs of its member agencies and their customers through 2035 and to increase their water supply reliability under normal and drought conditions. The Strategy is proceeding in three phases. Phase I was completed in June 2010 and defined the magnitude of the water supply issues, identified over 65 potential projects that could potentially be developed to meet the identified need, and laid out the scope for the Strategy development. Phase II A was completed in July 2012, and the Phase IIA Report included a refined focus on meeting the dry years needs of the agencies, and presented the project evaluation criteria and preliminary information for 17 projects. The Final Phase of the Strategy is scheduled to be complete by December 2014. The Final Strategy Report will include a refined estimate of how much additional supply reliability and new water supplies are needed throughout the BAWSCA service area through 2035, as well as a detailed analysis and ranking of the potential projects that could be developed to meet that need.

Additional information, including the economic impacts of drought and a Strategy Implementation Plan will be included in the Final Strategy Report.

Current Water Supply by Source

The sources of supply used by BAWSCA agencies vary little from one year to the next. Of the total amount of water used by BAWSCA agencies in FY 2011-12, 65% came from the SFPUC, 13% from groundwater, 18% from other sources (Santa Clara Valley Water District and the State Water Project), 1% from local surface water (primarily ACWD’s take from Lake Del Valle), and 3% from recycled water.

 

Current Water Use by Class of Customer

As with the source of supply, BAWSCA’s demand by customer class varies little over time. Among BAWSCA agencies in FY 2011-12, the residential sector accounted for 58% (131 mgd) of the 224 mgd consumed; commercial and industrial customers, 21% (47 mgd); government/other, 4% (10 mgd); dedicated irrigation, 10% (21 mgd), and unaccounted-for water, 7% (16 mgd). In FY 2011-12, there were 425,322 accounts (service connections) in the entire BAWSCA service area, 89% or 376,540 of which were residential.

 

Current and Projected Population

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The population of the BAWSCA service area increased from 1,701,756 to 1,709,230 between FY 2010-11 and FY 2011-12.

Climatological Data

In FY 2007-08 and FY 2008-09, rainfall totals recorded at 4 locations in the BAWSCA service area were lower than a 1948 – 2005 historical average by about five inches. In FY 2009-10 and FY 2010-11 rainfall totals recorded at these locations were approximately one inch higher than the average. In FY 2011-12, rainfall totals were again below the average, by approximately 6 inches.

 

Current Water Use Per Capita

Average residential per capita consumption (excluding Stanford) in the BAWSCA service area was 78 gpcpd in FY 2011-12, slightly more than the year before. This is 25% less than the estimated 104 gpcpd that was experienced during pre-drought FY 1986-87. In FY 2011-12, Westborough WD had the lowest residential per capita consumption at 47.4 gpcpd while Purissima Hills WD had the highest at 267.9 gpcpd. The average gross per capita consumption of the BAWSCA service area in FY 2011-12 was the same as that in FY 2010-11 – 127 gpcpd. FY 1985-86 (pre-drought) gross per capita was 182 gpcpd.

 

Single Family Water Bills (as of July 2010) /Water Rate Structure

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Water bill data has been calculated using each agency’s single family average monthly use. This information is summarized in Section 8. Among BAWSCA agencies, the average monthly bill ranged from a low of $28.48 for 8.5 units in the San Jose MWS – North service area to $209.80 for 26.9 units in Hillsborough. The average single family water bill among all BAWSCA agencies inclusive of the service charge was $60.61.

Average monthly residential use varied from 5.0 units (Brisbane/GVMID) to 32.4 units (Purissima Hills WD). Average monthly service charge was $12.45, ranging from a low of $5.00 (Palo Alto) to a high of $33.37 (Burlingame). Of 26 wholesale customers surveyed regarding water bills, six (ACWD, Burlingame, East Palo Alto, Millbrae, Santa Clara, and Westborough WD) have a uniform rate structure (same rate per unit of water for all volumes used). The other 20 agencies have inclining block rate structures in which the rate per unit increases as use increases.

 

Agency Profiles

Agency profiles Agency profiles were updated based on revisions supplied by agency representatives.